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profiling: write "correct" sample rate to gmon output

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This duration vs sample count is _significantly_ closer to the truth
than simply declaring the value to be 100Hz.

Change-Id: Ie8d8bdf1959e1aa7cead0631cd2c86afe77d1efc
Signed-off-by: Karl Palsson <karlp@tweak.net.au>
Reviewed-on: http://openocd.zylin.com/4221
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
This commit is contained in:
Karl Palsson 2017-09-08 15:44:52 +00:00 committed by Paul Fertser
parent 4e0371bf71
commit 9cd74c113c
1 changed files with 6 additions and 3 deletions
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9
src/target/target.c
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@ -3838,7 +3838,7 @@ typedef unsigned char UNIT[2]; /* unit of profiling */
/* Dump a gmon.out histogram file. */
static void write_gmon(uint32_t *samples, uint32_t sampleNum, const char *filename, bool with_range,
uint32_t start_address, uint32_t end_address, struct target *target)
uint32_t start_address, uint32_t end_address, struct target *target, uint32_t duration_ms)
{
uint32_t i;
FILE *f = fopen(filename, "w");
@ -3906,7 +3906,8 @@ static void write_gmon(uint32_t *samples, uint32_t sampleNum, const char *filena
writeLong(f, min, target); /* low_pc */
writeLong(f, max, target); /* high_pc */
writeLong(f, numBuckets, target); /* # of buckets */
writeLong(f, 100, target); /* KLUDGE! We lie, ca. 100Hz best case. */
float sample_rate = sampleNum / (duration_ms / 1000.0);
writeLong(f, sample_rate, target);
writeString(f, "seconds");
for (i = 0; i < (15-strlen("seconds")); i++)
writeData(f, &zero, 1);
@ -3955,6 +3956,7 @@ COMMAND_HANDLER(handle_profile_command)
return ERROR_FAIL;
}
uint64_t timestart_ms = timeval_ms();
/**
* Some cores let us sample the PC without the
* annoying halt/resume step; for example, ARMv7 PCSR.
@ -3966,6 +3968,7 @@ COMMAND_HANDLER(handle_profile_command)
free(samples);
return retval;
}
uint32_t duration_ms = timeval_ms() - timestart_ms;
assert(num_of_samples <= MAX_PROFILE_SAMPLE_NUM);
@ -3998,7 +4001,7 @@ COMMAND_HANDLER(handle_profile_command)
}
write_gmon(samples, num_of_samples, CMD_ARGV[1],
with_range, start_address, end_address, target);
with_range, start_address, end_address, target, duration_ms);
command_print(CMD_CTX, "Wrote %s", CMD_ARGV[1]);
free(samples);